Abstract
In this study, to better control the morphology of Mn3O4 prepared by roasting micron-sized spherical MnCO3, the pyrolysis kinetics of MnCO3 was investigated by measuring the thermogravimetry (TG) curves under different heating rates in air, and the pyrolysis kinetic mechanism function of MnCO3 was also calculated. The TG results showed that the pyrolysis of MnCO3 can be mainly divided into two stages, and the corresponding temperature range was 300–500 °C and 840–900 °C, respectively. The kinetics results showed that the activation energies of the two reaction stages of MnCO3 calculated using FWO method, KAS method, and Starink method were 315.13, 317.41, 318.54 kJ mol−1, and 1456.70, 1454.19, 1456.08 kJ mol−1, respectively. The kinetics mechanism models of two stages were determined as random nucleation and subsequent growth model using the master plot method, and the corresponding kinetic mechanism functions were G(α) = [− ln(1 − α)]3/2 and G(α) = [− ln(1 − α)]3/4, respectively. In addition, the mechanism function analysis results showed that an increase in the heating rate slightly affected the temperature difference (ΔT) for the completion of the reaction at each stage, which would have a different effect on the morphology of the product. The roasting experiment results confirmed the above theoretical conclusions.
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This study was supported by the National Natural Science Foundation of China (52004111, 51864019), Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology, the “Double Thousand Plan” Talent Project of Jiangxi Province (jxsq2018106051), and Jiangxi Province Natural Science Foundation of China (20181BAB206019).
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Li, Y., Li, Y., Zhang, Z. et al. Pyrolysis kinetics of manganese carbonate. J Therm Anal Calorim 147, 10801–10813 (2022). https://doi.org/10.1007/s10973-022-11251-5
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DOI: https://doi.org/10.1007/s10973-022-11251-5